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No. 317,265. Patented May 5,1885.

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UNITED STATES PATENT OEEicEO EDWIN A. wooD7 or UTicA, NEW YORK- METHOD 0F PREVENTING THE FORMATION OF ICE ON SHOW-WINDOWS- SPECIFICATION forming part of Letters Patent No.3l7,265, dated May 5, 1885.

Application filed December 20, 1893. (No model.)

To @ZZ whom it may concern:

Be it known that I, EDWIN A. WOOD, a citizen of the United States, residing at Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in the Method of Preventing the Formation of Ice on Show-Windows, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to improvements in the ventilation of show or display windows Vin stores, Ste.; and the object of my invention is to prevent the glass of such windows from becoming incrusted or coated with ice and frost during the winter season.

To this end my invention consists in forcing or conducting a current of dry heated air close to and on the inside ofthe window, and throughout its entire length and width, such current of dry heated air serving as a wall or barrier to prevent the moist air of the room or apartment from coming in contact with the windowglass.

Figure l is a sectional view of a store-room or apartment and show and display window with my improvements embodied therein. Fig. 2 is a top view of the ordinary pin radiator, which I prefer to use in heating the air in its passage to the window. Fig. 3 is a top or plan view of my device.

Heretofore many devices have been proposed and many expedients resorted to to prevent the incrustation ofthe glass in show and display windows with ice and frost. It has been proposed to convey the external air into the apartment, so as to keep the air therein at about the same temperature as the air on the outside of the building or apartment but the constant opening ofthe inner doors or sash to examine or arrange the goods lets in the heated air from the apartment, which,coming in contact with the cold plates of glass,condenses and turns to ice on the glass. lt has also been proposed to precipitate onto the glass currents of heated air, but such currents of heated air were precipitated from a point some distance back from the glass plate, and as a consequence came in contact with the glass in an angular direction, and were deflected or thrown back into the room or apartment at about the same angle. rIhis method was partially successful, but only prevented the formation or incrustation of 'ice at the point where the heated currents of air came in contact with the glass,while the other portions of the glass would become heavily coated or incrusted with ice.

I will now proceed to describe the devices or appliances which I have found best adapted to carry out my method; but I do not wish to confine myself to the apparatus herein shown, as other devices may be advantageously employed to carry out my invention.

A is the store-room or other apartment and B is the ordinary show-window.

C is the customary ledge or platform on which the display goods are placed. Underneath the ledge or platform C and floor D is secured a box or compartment, E, in which is located the ordinary radiators, G, which are connected to any suitable source or supply of steam by which the radiators are heated.` rlhe box or compartment is not made as wide as the window, is filled with the radiators, and terminates in a long narrow nozzle-like slot, F, of the same width as the window. The contracted nozzle-like opening F of the box E enters the show or display window close to and at the lower edge of the plate-glass, and in such a manner as to admit the heated current of dry air to rise in a vertical line the entire length and width of the glass, and thus forma barrier or wall which will keep the` moist air of the apartment from coming in contact with the glass of the window.

H is a duct or air-passage which leads from the external air or other suitable source of supply into the box or compartment E, and is provided with a bend or offset, I, which deiiects the air so it will enter at the lower portion or edge of the compartment E, and be evenly distributed through the series of radiators G, and thus a current of dry heated air is continually passed up in close proximity to the inner surface of the plate-glass, which on reaching the top of the show-window is de-4 flected backward into the store-room or compartment, as indicated by the arrows near the ceiling in Fig. l.

It is a well-known principle of physics that air when heated expands and rises to the upper portion of the room, while the cold air re- IOO mains near the floor, and by placing the heating devices below the window I am enabled to take advantage of this natural principle in physics to carry the heated air-currents upward in close contact with the glass of the window, and thus form a wall or barrier which effectually prevents the moist air of the room from coming in contact with the glass.

I do not wish to be understood as limiting myself to any particular kind of radiator; but a radiator having the greatest heating capacity is preferred.

I am aware that a series of gasjets or burn- Yers have been arranged on the inside of and near the bottom or show or display windows to prevent the incrustation of the same with ice.

I am also aware that the heated air from the top of the room has been drawn down through the show-window by a suitable draft; but in both instances the air of the room or apartment, which is more or less charged with moisture from the respirations of the occupants, is brought in contact with the glass 5 and such I do not claim.

I do not claim in this application the devices herein shown and described, but reserve the right to make a separate application therefor at some future time.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

The method herein described of preventing the formation of ice on show-windows7 the same consisting in causing a continuous current of dry heated air to pass in close proximity to the inner side of the plate or other glass from the bottom upward, so as to form a wall or barrier protecting the entire surface of the glass, and preventing the moist air of the room from coming in contact with the glass, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

EDVIN A. VVOOD.

lVitnesses:

H. H. IIMERMAN, GEORGE E. HorKINs. 

